Concrete reinforcement.



N. E. CLARK. CONCRETE REINFORCEMENT. APPLICATION FILED was 22,1908

maag m Patented m 11, 1915.

.20 formed by twisting adjacent sections'in re- NORRIS ELMOB-E CLARK, F PLAINVILLE, CONNECTICUT.

' oononnrn nsmroncnnnm.

To all whom it mag concern Be it known that I, NORRIS ELMons Crlamn'a citizen of the United States, re-

siding at Plainville, in the county ofHart-v ford'and State of Connecticut, have invented certain new and useful Improvements in Concrete Reinforcemenhpf which the following is a specification. 7

My 'invention relates particularly to metallic fabrics for reinforcing concrete and cement structures.

The main object is to provide an ex- .panded' metal fabric having parallel rod or bar members so formed as to be strong and have a good holding capacity in the concrete.

'- Another object is to provide as much strength and holding power as possible with a given quantity of metal. i

The rodmembers in the form shown are dev'erse directions. The rod or'bar members are deformedfor instanceby twisting so as toincrease the bonding eifct in the concrete and prevent the formation of lines of cleavage.

By working the rod or bar members while cold the elastic limit is increased so that the fabric performs its reinforcing function With greater efficiency. I The drawing shows a plan view of an expanded metal fabric embodying one form The fabric as shown is formed by slitting a sheet of metal, expanding it so as to separate the bars 1, 1,1 and leaving them connected integrally bythe st ands such as 12,

- 13 and 14, 15. Each bar is then twisted as the longitudinal tension bars of which have for instance by applying stationary jaws to the points 16 and 17 and a rotating jaw to the point 18. This produces oppositely twisted helices on the opposite sides of the point 18 as shown. 'The section from 17 to 19 is then twisted in similar manner and so also the sections of the other bars. Thus an expanded metal fabric may be produced,

Specification of Letters Zetent. Patentd May 11, 1915, Application filed June 22, 1908. Serial No. 139,848.

a higher elastic limit than is possible by any other method. By this construction the longitudinal parallel bar or rod members are deformed so as to give a better bonding effect and prevent slipping and the formation of lines of cleavage in the concrete. By twisting the bars or rod members while cold their elastic limit is increased above that of the strands or tie members 12 and 13 so that while the bars are stifi'er, the strands or ties of the reticuelastic limit greater than that of the tie -members.

2. An expanded metal reinforcing fabric comprising twisted bar members and tie members integrally connecting adjacent twisted bar members;

3. An expanded metal reinforcing fabric comprising parallel bar members. with. de-

formation at the sides for bonding engagement in concrete and. bent tie members in tegrally, connecting adjacent bar members and forming. a mesh-work, the bar members having higher elastic limit than the tie members. i

d. A reticulated reinforcing fabric for concrete comprising longitudinal (parallel bar members having lateral deformation for affording bonding engagement in the concrete andreticulated sections integrally con meeting the adjacent edges of adjacent bar members, the bar members having a materially higher elastic limit than the metal of the reticulated sections.

NORRIS ELMORE CLARK.

Witnesses:

E. Bnanrono, Row. .G. ALLYN. 

